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The Reproductive Biology, Natural Enemies and Biological Control of Delairea Odorata Lem

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The Reproductive Biology, Natural Enemies and Biological Control of Delairea Odorata Lem The Reproductive Biology, Natural Enemies and Biological Control of Delairea odorata Lem. by Carol Ann Rolando Submitted in fulfilment of the requirements for the degree of Master of Science in the School of Botany and Zoology, University of Natal, Pietermaritzburg, March 2000 ABSTRACT Delairea odorata Lem., an asteraceous perennial vine indigenous to southern Africa, has become naturalised and invasive in many subtropical regions including California, South Australia and Hawaii. Biological control offers a potential long term solution to the management of this species in exotic locations. This study analysed aspects ofthe biology ofD. odorata in its native environment to determine its suitability to classical biological control. To this end an examination of the reproductive biology and natural enemies of D. odorata was made. A study of the pyrrolizidine alkaloid profile was also conducted. Reproductive biology: Delairea odorata reproduces both sexually by seeds and asexually by stolons. The flowering season occurs over the autumn months from April to June. Results ofthe pollination trials indicate thatD. odorata is a cross compatible species and an obligate outbreeder. There is no specialised pollination system and the predorninant pollinators belong to the families Apidae, Syrphidae and Calliphoridae. Following pollination, numerous small achenes are produced. Laboratory trials indicate that these achenes germinate readily between 10 and 25 QC and, although germination occurs in both the light and dark, light clearly stimulates seed germination. Greenhouse trials conducted to determine the effect of light on growth and reproduction indicate that D. odorata is a shade tolerant species which shows plasticity in terms ofgrowth form and deployment ofbiomass in response to changes in light intensity. Growth rate and allocation ofbiomass to vegetative and sexual reproduction are highest at an intermediate light level. However, greatest allocation ofbiomass is to stem growth regardless oflight level. Natural enemies: Surveys for potential biological control agents against Delairea odorata were conducted in KwaZulu-Natal and several phytophagous species were associated with the plant. However, only one potentially suitable control agent was identified, a stem galling tephritid fly, Parafreutreta regalis Munro. Preliminary studies indicate this species to be fairly host-specific, a valuable asset if it is to be considered as a control agent. Furthermore, as D. odorata proliferates extensively by means ofstem regeneration and elongation, galling ofthese growing points by P. regalis may limit stolon spread in exotic locations. Two species ofparasitic wasp (Braconidae) were found to parasitise P. regalis pupae. IfP. regalis is to be used as a control agent the likelihood ofparasitisation in the new environment must be determined. 11 Pyrrolizidine alkaloids: Host-specificity in insects is often dependent on host-plant chemistry (e.g. alkaloids or essential oils). Thus prior to any biological control programme it is important to determine ifthere are ecotypes ofthe host plant present. An investigation to determine the specificity ofthe pyrrolizidine alkaloid profile ofD. odorata, occurring across KwaZulu-Natal, was made. The results indicate the presence of nine retronecine based pyrrolizidine alkaloids which occur in similar proportions in locally distributed plants. However, these alkaloid profiles differ considerably from those published for D. odorata occurring in California. This is an interesting and important result which indicates that chemotypes ofD. odorata may exist, a factor which must be considered in the initiation ofany biocontrol. Ifchemotypes ofD. odorata are present this may affect the behaviour ofnatural control agents on the exotic plant populations. III Preface The experimental work in this thesis was carried out under the supervision ofDr T. Edwards, at the School ofZoology and Botany, University ofNatal, Pietermaritzburg from February 1998 to August 1999. The results ofthis study have not been submitted in any form to another university and, except where acknowledged, are the results ofmy own work. ~~nn Rolando IV Contents page Abstract , i Preface iii Acknowledgements vii List of Figures viii List of Tables xiv Chapter 1. General introduction 1 1.1 Project description 1 1.2 Weeds: their definition, attributes and control 2 1.3 Biological control 5 1.4 General background to the present study . ........ .... 11 1.5 Overall aims of the present study 19 Chapter 2. Weeds of the Asteraceae and their biological control: a review " ..................... .. 21 2.1 Introduction 21 2.2 The database and methods used for this review 23 2.3 Biocontrol agents used in the control of the Asteraceae 24 2.4 Summary and conclusions 33 Chapter 3. Floral biology, breeding system and pollination. ...... .. 35 3.1 Introduction 35 3.2 Materials and methods 38 3.3 Results 41 3.4 Discussion 48 v Chapter 4. Seed biology . ..................... .. 52 4.1 Introduction 52 4.2 Materials and methods 55 4.3 Results 57 4.4 Discussion 65 4.5 Concluding comments 68 Chapter 5. Growth and reproduction in relation to light availability .. 70 5.1 Introduction 70. 5.2 Materials and methods 73 5.3 Results 74 5.4 Discussion 82 5.5 Concluding comments 85 Chapter 6. Natural enemies of De/airea odorata and a potential biological control agent. .. .. ......... ... ..... .. 86 Section 6.1. Natural enemies 86 6.1.1 Introduction 86 6.1 .2 Materials and methods 88 6.1.3 Results and discussion 88 Section 6.2. Studies on a potential biocontrol agent - Parafreutreta regalis Munro (Diptera: Tephritidae) 92 6.2.1 Introduction 92 6.2.2 Materials and methods 92 6.2.3 Results and discussion 93 6.2.4 Concluding comments 109 VI Chapter 7. Pyrrolizidine alkaloids 112 7.1 Introduction 112 7.2 Materials and methods 114 7.2.1 Development of an analytical technique 114 7.2.2 Methods used for the extraction, isolation and identification of alkaloids . 117 7.3 Results and discussion 118 7.4 Concluding comments 126 Chapter 8. Summary and conclusions 129 Chapter 9. References 133 Appendix A . .. ..... .. .. .. ... .. 162 vu Acknowledgements I would like to thank my supervisor, Or T. Edwards, for the advice and encouragement which he gave me during the course of this investigation. Special thanks must also go to: Prof. J. van Staden for both his academic and financial support for which I am extremely grateful. Or R. M. Miller for his advice and help with identification of invertebrates. Or M. Smith for his expertise, assistance and patience concerning the pyrrolizidine alkaloid analysis. Credit is also due to the following persons: Or E. Grobbelaar (PPRI) and Or R. Muller (Transvaal Museum) for their help with identification of beetles. OrM. Kruger (Transvaal Museum) for his assistance with the identification of moths and butterflies. The staff of the Electron Microscope Unit for their help with scanning electron microscopy. I would also like to thank my parents for their continued support and encouragement. Finally, I would like to thank Hallam who provided the confidence, inspiration, motivation and support when I needed it - which was most of the time! Vlll List of Figun!s Figure 1.1 Distribution of Oelairea odorata in South Africa (Distribution map is based on specimens lodged at herbaria: PRE and NU) 14 Figure 1.2 Distribution of Oelairea odorata on the main Hawaiian Islands as of 1986 (HEAR, 1986) 15 Figure 3.1 Intact anther collar, of a 0. odorata floret, consisting of five - syngenecious anthers.. 42 Figure 3.2 Status of style when the O. odorata floret is still closed. Floret and anther collar have been prised open to show style apex positioned at the base of the anther collar 42 Figure 3.3 The style pushes through the narrow anther collar of the O. odorata florets and removes pollen out of the cylinder by means of hairs on the outer surface. 43 Figure 3.4 After the style has extended beyond the anther collar, the style arms spread apart and expose the stigmatic surface. 43 Figure 3.5 a-c Phenology of O. odorata at (a) Ferncliffe (b) Ingele and (c) Dargle ........... ..... ........... .. .... ..... .. .... .. 44 Figure 3.6 a&b Results of experimental pollinations on 0. odorata capitula expressed as (a) the mean number offruits percapitulum (error bars represent 95 % confidence intervals) and (b) the percentage capitula which set fruit (numbers refer to the total number of capitula used in the test). 46 IX Figure 3.7 Mean number offruits per capitulum for pollen limitation experiments carried out on D. odorata capitula. Error bar represents 95 % confidence interval. HP: hand-pollinated capitula; EC: open pollinated capitula on experimental plants; CC: open pollinated capitula on control plants , 47 Figure 4.1 Increase in mass (water uptake) offruits of D. odorata imbibed at 25 "C for 12 days. Photoperiod was set at 16 h lighU8h dark. Error bars represent standard error 58 Figure 4.2 Cumulative % germination of D. odorata achenes maintained for 15 days at one of five temperatures. Photoperiod was set at 16 h IighU 8 h dark. Error bars represent standard error. .. .. .. 59 Figure 4.3 Cumulative % germination of D. odorata achenes maintained for 20 days in the dark at one of five temperatures. Error bars represent standard error 59 Figure 4.4 Cumulative % germination of D. odorata achenes following treatment for one month in the dark at 0 "C. Achenes were germinated at 15°C in both the light and the dark. Error bars represent standard error 61 Figure 4.5 Final % germination, in the light and dark, of dry stored (1 yr) D. odorata achenes, following 20 days treatment at 10, 15 and 25°C. Error bars represent standard error. 62 Figure 4.6 Emergence and subsequent survival (%) of D. odorata achenes following eight months treatment at 71,45 and 17 % sunlight. Error bars represent standard error . ... ... ... ... .. .. 63 x Figure 4.7 Monthly increase in stem length (mm) of D. odorata seedlings exposed to 71,45 and 17 % sunlight. Error bars represent standard error 64 Figure 4.8 Monthly increase in leaf numbe r of D.
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